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[TS] Replace the constant toString call approximation

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评估

难度
4/5
预计耗时
3-5 天
新手友好度
62/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
活跃
技术栈
kotlin, node.js, typescript
领域
compilers

调研方向

Read usvm-ts/src/main/kotlin/org/usvm/machine/expr/CallApproximations.kt around lines 90-107, then replay the provided text() example with TypeScript/Node.js as the concrete reference. Add a focused symbolic test covering the supported receiver case and verify that unsupported operand or environment behavior remains explicit rather than exact.

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描述

enhancement

Problem

The generic .toString() approximation returns "I am a string" for every receiver.

Minimal TypeScript example

export function text(): string {
  return (42).toString();
}

Expected behavior

text() returns "42". Select semantics based on proven receiver type; avoid applying one fixed result to arrays, numbers and arbitrary objects. Unknown receiver behavior must remain explicit.

Current source evidence

ToString approximation.

Checked against USVM main 53dce8f3bca2713642c783ba8308a6a360a9e516. This exact snippet is a proposed regression from source audit; it has not yet been run as a new end-to-end test. #368 audits the existing call approximations but does not implement these individual fixes.

Acceptance criteria

  • A focused test checks the symbolic outcome without reporting an approximation as exact semantics.
  • The supported case agrees with concrete TypeScript/Node.js replay.
  • Unsupported operand or environment cases remain explicit.
主要语言
Kotlin
星标
33
派生
27
平均合并
2 天 20 小时
30 天内合并 PR
9

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